Capacitor question.

When your yard see's whats inside a can cap then they may not be quite so hip on buying them,
Thanks to Wiki for this;

*The electrolyte is usually boric acid or sodium borate in aqueous solution, together with various sugars or ethylene glycol which are added to retard evaporation.
*Electrolytes may be toxic or corrosive. Working with the electrolyte requires safe working practice and appropriate protective equipment such as gloves and safety glasses.

Back in the day when I repaired CB radio's the truckdrivers were always hooking their radio's up backwards
due to a wiring mess up. The protector cap would blow up (leak) and the solvent inside would eat the finish off the inside of the metal radio cover.